Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/53679
標題: Fe Chemistry in the Rhizosphere of Paddy Rice
水稻根圈土壤鐵化學之探討
作者: 王尚禮
關鍵字: 基礎研究;農業環境保護;植物營養;鐵缺乏;根分泌物;根圈土壤化學
摘要: 
鐵為作物之必需營養元素之一,土壤中鐵的低有效性會限制作物對鐵的吸收,進而影響作物生長。欲提升植物對土壤中鐵的利用效率,必須先了解植物對其吸收之相關機制,其中根分泌物和根圈土壤之交互作用又為控制鐵的植物有效性的主要關鍵。本研究將探討水稻根的分泌物和根圈土壤之交互作用如何決定土壤中鐵的生物有效性,尤其是當水稻感知缺鐵情況時,其根部不同部位的分泌物組成所產生的對應變化,以及後續對土壤根圈中化學物種分布所產生的影響。本研究將探討(1)在鐵缺乏的影響下,水稻根的不同部位之分泌物組成變化,以期鑑定出控制鐵有效性之水稻分泌物、(2)水稻根圈土壤中根圈分泌物組成,以及鐵之物種型態分布隨時間和空間的變化;(3)水稻根分泌物如何影響鐵礦物的生成,以及鐵自相關礦物溶解和脫附的反應機制,藉以說明土壤中相關過程之反應機制。預期本研究之成果,將有助於解釋水稻根分泌物如何決定鐵之根圈化學,水稻根和其根圈環境之交互作用在水稻對土壤鐵的整個吸收過程中所扮演的角色,以及在生物化學基礎上水稻如何透過調控根圈環境來適應缺鐵之營養逆境。

Iron (Fe) is an essential microelement for plant growth. The low availability of Fe insoils, mainly resulting from its low solubility and strong retention to soil constituents, canlead to Fe deficiency in plants. Since the release of Fe from soil solids into soil solutions forplant utilization is controlled by the interactions between root exudates and soil constituents,it is critical to understand the interaction mechanisms for enhancing the resistance of plants toFe deficiency in soils. Accordingly, the goal of this study is to investigate the roles of rootexudates in determining the formations and distributions of Fe phases in the rhizosphere ofdifferent rice cultivars, the Fe-mobilization efficiency of rice root exudates, and the reactionof rice root exudates to solid phases in paddy soils with an emphasis on the interactiveprocesses between the rice root and rhizosphere soil. There are three lines of attack: (1) todetermine the changes in the compositions of the root exudates of paddy rice induced by Fedeficient conditions and identify novel compounds in rice root exudates with specificfunctions in the selective solubilization and mobilization of Fe; (2) to study the functions ofrice root exudates and micro-scale processes in determining the Fe speciation, and thetemporal and spatial distributions of root exudations and mineral compositions in therhizosphere; (3) to investigate the effects of root exudates on the formation of Fe-containingminerals and the reaction rates and mechanisms of rice root exudates with Fe-bearingminerals to clarify functions in regulating Fe solubility in the rice rhizosphere. The results ofthis proposed research will provide essential information for understanding the interaction andfeedback mechanisms between the rice root and rhizosphere soil in controlling Fe availabilityfor rice uptake and bringing insights to rhizosphere biochemical processes controlling the Feuptake of rice plants.
URI: http://hdl.handle.net/11455/53679
其他識別: NSC100-2628-B005-001-MY3
Appears in Collections:土壤環境科學系

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